At 09:58 AM 6/10/2004, you wrote: >Thanks - that gives me more confidence. Still bothers me that Don Reid >did not like the idea - I was expecting a boffin (like him) to step up >and declare this to be as good as (or better). > >My instinct is to stagger the WAF bolt holes so as to void having them >on the same line - anyone have any thoughts on that. Holes in a row >offer images of the perforations in toilet paper.
You should notice that in my original answer, I said "should not go through the glue line". I did not say "must not". If I were in that situation, I would try to align the laminations so that the hole misses the glue line. If I could not, then I would make darn sure that the hole is well drilled, perpendicular and also reamed to size. In the traditional construction, it is also acceptable to do a lot of different scarfing and inlaying techniques. Larger pieces may be scarfed with smaller. Cross banding (high density overlay, like birch plywood) can be inserted into the interior of the bolted joint area. This is tough to describe, but think of a mortice and tenon joint. The tenon is made of high density wood or plywood and glued into the mortice. This high density insert is trimmed flush with the end of the spar. The bolts then go through the tenon and spar material. As long as the spacing is greater than the allowable minimum, it makes no difference at all whether they are in line or staggered. Don Reid - donreid "at" erols.com Bumpass, Va Visit my web sites at: AeroFoil, a 2-D Airfoil Design And Analysis Computer Program: http://www.eaa231.org/AeroFoil/index.htm KR2XL construction: http://users.erols.com/donreid/kr_page.htm Aviation Surplus: http://users.erols.com/donreid/Airparts.htm EAA Chapter 231: http://eaa231.org Ultralights: http://usua250.org VA EAA State Fly-in: http://vaeaa.org
